/*
 * HTML5 Parser By Sam Blowes
 *
 * Designed for HTML5 documents
 *
 * Original code by John Resig (ejohn.org)
 * http://ejohn.org/blog/pure-javascript-html-parser/
 * Original code by Erik Arvidsson, Mozilla Public License
 * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
 *
 * ----------------------------------------------------------------------------
 * License
 * ----------------------------------------------------------------------------
 *
 * This code is triple licensed using Apache Software License 2.0,
 * Mozilla Public License or GNU Public License
 *
 * ////////////////////////////////////////////////////////////////////////////
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * ////////////////////////////////////////////////////////////////////////////
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Simple HTML Parser.
 *
 * The Initial Developer of the Original Code is Erik Arvidsson.
 * Portions created by Erik Arvidssson are Copyright (C) 2004. All Rights
 * Reserved.
 *
 * ////////////////////////////////////////////////////////////////////////////
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * ----------------------------------------------------------------------------
 * Usage
 * ----------------------------------------------------------------------------
 *
 * // Use like so:
 * HTMLParser(htmlString, {
 *     start: function(tag, attrs, unary) {},
 *     end: function(tag) {},
 *     chars: function(text) {},
 *     comment: function(text) {}
 * });
 *
 * // or to get an XML string:
 * HTMLtoXML(htmlString);
 *
 * // or to get an XML DOM Document
 * HTMLtoDOM(htmlString);
 *
 * // or to inject into an existing document/DOM node
 * HTMLtoDOM(htmlString, document);
 * HTMLtoDOM(htmlString, document.body);
 *
 */
// Regular Expressions for parsing tags and attributes
var startTag = /^<([-A-Za-z0-9_]+)((?:\s+[a-zA-Z_:][-a-zA-Z0-9_:.]*(?:\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|[^>\s]+))?)*)\s*(\/?)>/
var endTag = /^<\/([-A-Za-z0-9_]+)[^>]*>/
var attr = /([a-zA-Z_:][-a-zA-Z0-9_:.]*)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|([^>\s]+)))?/g // Empty Elements - HTML 5

var empty = makeMap('area,base,basefont,br,col,frame,hr,img,input,link,meta,param,embed,command,keygen,source,track,wbr') // Block Elements - HTML 5
// fixed by xxx 将 ins 标签从块级名单中移除

var block = makeMap('a,address,article,applet,aside,audio,blockquote,button,canvas,center,dd,del,dir,div,dl,dt,fieldset,figcaption,figure,footer,form,frameset,h1,h2,h3,h4,h5,h6,header,hgroup,hr,iframe,isindex,li,map,menu,noframes,noscript,object,ol,output,p,pre,section,script,table,tbody,td,tfoot,th,thead,tr,ul,video') // Inline Elements - HTML 5

var inline = makeMap('abbr,acronym,applet,b,basefont,bdo,big,br,button,cite,code,del,dfn,em,font,i,iframe,img,input,ins,kbd,label,map,object,q,s,samp,script,select,small,span,strike,strong,sub,sup,textarea,tt,u,var') // Elements that you can, intentionally, leave open
// (and which close themselves)

var closeSelf = makeMap('colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr') // Attributes that have their values filled in disabled="disabled"

var fillAttrs = makeMap('checked,compact,declare,defer,disabled,ismap,multiple,nohref,noresize,noshade,nowrap,readonly,selected') // Special Elements (can contain anything)

var special = makeMap('script,style')
function HTMLParser(html, handler) {
	var index
	var chars
	var match
	var stack = []
	var last = html

	stack.last = function() {
		return this[this.length - 1]
	}

	while (html) {
		chars = true // Make sure we're not in a script or style element

		if (!stack.last() || !special[stack.last()]) {
			// Comment
			if (html.indexOf('<!--') == 0) {
				index = html.indexOf('-->')

				if (index >= 0) {
					if (handler.comment) {
						handler.comment(html.substring(4, index))
					}

					html = html.substring(index + 3)
					chars = false
				} // end tag
			} else if (html.indexOf('</') == 0) {
				match = html.match(endTag)

				if (match) {
					html = html.substring(match[0].length)
					match[0].replace(endTag, parseEndTag)
					chars = false
				} // start tag
			} else if (html.indexOf('<') == 0) {
				match = html.match(startTag)

				if (match) {
					html = html.substring(match[0].length)
					match[0].replace(startTag, parseStartTag)
					chars = false
				}
			}

			if (chars) {
				index = html.indexOf('<')
				var text = index < 0 ? html : html.substring(0, index)
				html = index < 0 ? '' : html.substring(index)

				if (handler.chars) {
					handler.chars(text)
				}
			}
		} else {
			html = html.replace(new RegExp('([\\s\\S]*?)<\/' + stack.last() + '[^>]*>'), function(all, text) {
				text = text.replace(/<!--([\s\S]*?)-->|<!\[CDATA\[([\s\S]*?)]]>/g, '$1$2')

				if (handler.chars) {
					handler.chars(text)
				}

				return ''
			})
			parseEndTag('', stack.last())
		}

		if (html == last) {
			throw 'Parse Error: ' + html
		}

		last = html
	} // Clean up any remaining tags

	parseEndTag()

	function parseStartTag(tag, tagName, rest, unary) {
		tagName = tagName.toLowerCase()

		if (block[tagName]) {
			while (stack.last() && inline[stack.last()]) {
				parseEndTag('', stack.last())
			}
		}

		if (closeSelf[tagName] && stack.last() == tagName) {
			parseEndTag('', tagName)
		}

		unary = empty[tagName] || !!unary

		if (!unary) {
			stack.push(tagName)
		}

		if (handler.start) {
			var attrs = []
			rest.replace(attr, function(match, name) {
				var value = arguments[2] ? arguments[2] : arguments[3] ? arguments[3] : arguments[4] ? arguments[4] : fillAttrs[name] ? name : ''
				attrs.push({
					name: name,
					value: value,
					escaped: value.replace(/(^|[^\\])"/g, '$1\\\"') // "

				})
			})

			if (handler.start) {
				handler.start(tagName, attrs, unary)
			}
		}
	}

	function parseEndTag(tag, tagName) {
		// If no tag name is provided, clean shop
		if (!tagName) {
			var pos = 0
		} // Find the closest opened tag of the same type
		else {
			for (var pos = stack.length - 1; pos >= 0; pos--) {
				if (stack[pos] == tagName) {
					break
				}
			}
		}

		if (pos >= 0) {
			// Close all the open elements, up the stack
			for (var i = stack.length - 1; i >= pos; i--) {
				if (handler.end) {
					handler.end(stack[i])
				}
			} // Remove the open elements from the stack

			stack.length = pos
		}
	}
}

function makeMap(str) {
	var obj = {}
	var items = str.split(',')

	for (var i = 0; i < items.length; i++) {
		obj[items[i]] = true
	}

	return obj
}

function removeDOCTYPE(html) {
	return html.replace(/<\?xml.*\?>\n/, '').replace(/<!doctype.*>\n/, '').replace(/<!DOCTYPE.*>\n/, '')
}

function parseAttrs(attrs) {
	return attrs.reduce(function(pre, attr) {
		var value = attr.value
		var name = attr.name

		if (pre[name]) {
			pre[name] = pre[name] + ' ' + value
		} else {
			pre[name] = value
		}

		return pre
	}, {})
}

function parseHtml(html) {
	html = removeDOCTYPE(html)
	var stacks = []
	var results = {
		node: 'root',
		children: []
	}
	HTMLParser(html, {
		start: function start(tag, attrs, unary) {
			var node = {
				name: tag
			}

			if (attrs.length !== 0) {
				node.attrs = parseAttrs(attrs)
			}

			if (unary) {
				var parent = stacks[0] || results

				if (!parent.children) {
					parent.children = []
				}

				parent.children.push(node)
			} else {
				stacks.unshift(node)
			}
		},
		end: function end(tag) {
			var node = stacks.shift()
			if (node.name !== tag) console.error('invalid state: mismatch end tag')

			if (stacks.length === 0) {
				results.children.push(node)
			} else {
				var parent = stacks[0]

				if (!parent.children) {
					parent.children = []
				}

				parent.children.push(node)
			}
		},
		chars: function chars(text) {
			var node = {
				type: 'text',
				text: text
			}

			if (stacks.length === 0) {
				results.children.push(node)
			} else {
				var parent = stacks[0]

				if (!parent.children) {
					parent.children = []
				}

				parent.children.push(node)
			}
		},
		comment: function comment(text) {
			var node = {
				node: 'comment',
				text: text
			}
			var parent = stacks[0]

			if (!parent.children) {
				parent.children = []
			}

			parent.children.push(node)
		}
	})
	return results.children
}

export default parseHtml
